The ortho-nitrophenyl-B-galactopuranoside (ONPG) test is most useful when differentiating:

Hospital patients with indwelling catheters (long-term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder) are susceptible to infections because:

What two bacteria produce swarming colonies on nonselective media such as sheep blood agar?

Are antibiotics typically used to treat Salmonella infections?  Why or why not?

A potentially fatal infection called hemolytic uremic syndrome can be a complication following infection with:

The Archae:

Three blood cultures taken from a 30 year-old patient receiving chemotherapy and admitted with a urinary tract infection grew lactose-negative, motile, gram negative rods prior to antibiotic therapy.  Given the following reactions, what is the most likely organism present?    TSI = A/A H2S +                                 Indole = Pos MR = Pos                                            VP = Neg Phenylalanine deaminase = Pos             Urease = Pos Citrate = Neg                                     Gelatin hydrolysis = Pos

You have isolated a gram negative bacillus.  What is the first biochemical test to perform in order to determine the identification tests to set up?

What organism is an opportunistic pathogen striking the immunocompromised patient in Florida and produces a violet pigment on nonselective agar?

A bloody stool from a 26 year-old woman with 3 days of severe diarrhea showed the following results at 48 hours after being plated on the following media:         MacConkey agar: little normal flora with many nonlactose-fermenting colonies       Hektoen enteric agar: many blue-green colonies       Clear colonies from the MacConkey agar tested negative for oxidase, indole,                    urease, motility and H2S   The most likely identification is: